| Ice-point: | The melting point of ice under 1 atm pressure, it is equal to 0 or 32. |
| Ideal gas Equation: | PV = nRT |
| Impulse: | The product of force and time for which force acts, also equal to the change in momentum. |
| Inertia: | The property of a body to resist a change in its state of rest or of uniform motion. |
| Infrasonic: | Sound waves of frequency less than 20 Hz, below the range of human hearing. |
| Insulators: | Materials like wood that are poor conductors of heat or electricity. |
| Interference: | The redistribution of energy due to superposition of waves from coherent sources, resulting in alternate light and dark bands. |
| Internal energy: | Sum of the kinetic energy and potential energy of all molecules of an object. |
| Isobaric process: | In which pressure remains constant. |
| Isochoric process: | In which volume remains constant. |
| Isothermal process: | In which temperature remains constant. |
| Isotope: | atoms of the same element with same atomic no (no of protons) but different mass no (no of neutrons). |
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